# A solid cube of mass 5 kg is placed on a rough horizontal surface, in xy-  plane as shown. The friction coefficient between the surface and the  cube is 0.4. An external force $\stackrel{\to }{F}$ = 6$\stackrel{^}{i}$ + 8$\stackrel{^}{j}$ + 20$\stackrel{^}{k}$ ​ N is applied on the cube.  (use g = 10 m/${s}^{2}$)  (A) The block starts slipping over the surface  (B) The friction force on the cube by the surface is 10 N.  (C) The friction force acts in xy-plane at angle 12$7°$ with the positive  x-axis in clockwise direction.  (D) The contact force exerted by the surface on the cube is 10$\sqrt{10}$N. ​

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